Windows client crash if sync folder not found

[atomiful]

Expected behaviour

Owncloud Windows client starts normally on Windows startup even if sync folder is not available on startup.

Actual behaviour

Owncloud Windows client crashes if sync folder is not available.

Steps to reproduce

1. Create a virtual disk .vhdx and enable Bitlocker
2. Create virtual file sync on that mounted virtual disk
3. Close Owncloud + Unmount virtual disk OR reboot computer
4. Start Computer OR Start Owncloud client
5. The application crashes until I mount the sync folder (virtual drive in my case)

Client configuration

Client version:
2.7.4 (build 2934)
Operating system:
Windows 10 20H2
OS language:
French

Logs

01-18 14:31:15:080 [ info gui.application ]: "################## ownCloud locale:[fr_FR] ui_lang:[] version:[2.7.4 (build 2934)] os:[Windows 10 (10.0)]"
01-18 14:31:15:080 [ info gui.application ]: Using "fr_FR" translation
01-18 14:31:15:080 [ info gui.application ]: VFS windows plugin is available
01-18 14:31:15:080 [ info gui.application ]: VFS suffix plugin is available
01-18 14:31:15:080 [ debug gui.socketapi ] [ OCC::SocketApi::SocketApi ]: creating "//./pipe" true
01-18 14:31:15:080 [ info gui.socketapi ]: server started, listening at "\\.\pipe\ownCloud-myuser"
01-18 14:31:15:080 [ info gui.folder.manager ]: setting remote poll timer interval to 30000 msec
01-18 14:31:15:096 [ info gui.account.manager ]: Restored: 0 unknown certs.
01-18 14:31:15:475 [ debug gui.activity ] [ OCC::ActivitySettings::setNotificationRefreshInterval ]: Starting Notification refresh timer with 300 sec interval
01-18 14:31:15:490 [ debug gui.updater ] [ OCC::Updater::create ]: QUrl("https://updates.owncloud.com/client/?version=2.7.4.2934&platform=win32&oem=ownCloud&buildArch=x86_64&currentArch=x86_64&versionsuffix=&msi=true")
01-18 14:31:15:505 [ info gui.application ]: Tray menu workarounds: noabouttoshow: false fakedoubleclick: false showhide: false manualvisibility: false
01-18 14:31:15:512 [ info gui.folder.manager ]: Setup folders from settings file
01-18 14:31:15:513 [ warning sync.database ]: Could not find a writable database path "O:/OWNCLOUD/.sync_c398303c13ec.db" "Le chemin d’accès spécifié est introuvable."
01-18 14:31:15:514 [ info plugins ]: Created VFS instance from plugin "owncloudsync_vfs_win"
01-18 14:31:15:515 [ info sync.database ]: Detected filesystem "" for "O:/OWNCLOUD/.sync_c398303c13ec.db"
01-18 14:31:15:515 [ warning gui.folder ]: Broken symlink: "O:/OWNCLOUD/"
01-18 14:31:15:516 [ info sync.configfile ]: Adding system ignore list to csync: "C:/Program Files/ownCloud/sync-exclude.lst"
01-18 14:31:15:540 [ warning sync.vfs.win ]: Could not find StorageFolder for "O:\OWNCLOUD" error: "WindowsError: ffffffff8007000f: Le lecteur spécifié est introuvable."
01-18 14:31:16:529 [ fatal default ]: CfConnectSyncRoot: O:\OWNCLOUD error: WindowsError: ffffffff80070003: Le chemin d?acc?s sp?cifi? est introuvable.

[TheOneRing]

Duplicate of #8321